عنوان مقاله [English]
In this study, the mechanical properties and durability of composites containing fibers and polymers have been investigated. For this purpose, calcium aluminate cement and Portland cement were used as binding agents. Glass fiber and polymer (Forton VF- ) have been used to modify the mix. The specimens were prepared using and glass fiber (vol./vol) and polymer by cement weight. The length of the fibers was mm. The mechanical tests performed consist of compressive strength, flexural strength, tensile strength, flexural toughness and impact strength, and RCMT , as well as the shrinkage test. The compressive strength test was performed at the ages of , , and days. The mixtures made with calcium aluminate cement had higher compressive strength due to fast formation of microstructure compared to the Portland cement mixtures, so that -day compressive strength of Portland cement mix was comparable to -day compressive strength of calcium aluminate mortar. By adding the polymer to the mixtures, the compressive strength was reduced. It was also observed that by increasing the glass fiber content from to , compressive strength became lower. By increasing age the compressive strength was enhanced due to the formation of polymer films in the porous structure of the mixtures and improving the cement hydration. In polymer modified specimens, the flexural strength was also increased due to the production of polymer films in the structure of mixes. Flexural strength was increased by the addition of glass fibers due to high aspect ratio of the glass fibers and well-formed Interfacial Transition Zone (ITZ). The addition of glass fiber from to influenced the bending strength of polymer specimens and had an enhancing effect on the tensile strength, flexural toughness and impact resistance. However, in the durability test, fiber incorporated mixtures had higher chloride ion penetration. Adding fibers to the blends reduced the amount of shrinkage.